KABUL, Afghanistan (AP) — A bomb killed four troops from the U.S.-led coalition and seriously wounded two others in southern Afghanistan on Saturday, the coalition said.

The bomb went off as the troops were conducting operations in Kandahar province, a coalition statement said.

It didn't release the nationalities of the victims or other details.

Afghanistan is seeing a resurgence of violence even as the U.S. and NATO have poured thousands of new troops into the country.

Last year, more than 8,000 people were killed in insurgency-related attacks in Afghanistan — the most since the 2001 invasion — and violence has claimed more than 1,500 lives this year.